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A good intake grate will help a lot if it is cavitating. But will not help top speed unless the ski is porpoising. I have a R&D intake on my gp and would recommend it. Also there are goog grates from Riva and Pro-tec. If the GP is porpoising (bouncing) you will need to replace the trim tabs with aluminum ones and shim the rear of the ride plate to smooth out the ride.

Budman
 

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If it is a late 98 or 99 GP (No factory tabs) than you can get the tabs from pro-tec:

2002

If it is a 97 or early 98(factory installed plastic tabs) then you will have to have them made. There are a couple of guys on green hulk forum that make them but not sure who. As for the ride plate. I had good luck shimming the rear of the factory plate. You can gain a couple of mph with a shredmaster plate. Riva and protec also make good plates. Here is the shredmaster:

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